JPH0511105A - Color filter manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for manufacturing a color filter, which does not require post-treatment and can be manufactured at low cost. [Structure] The table 21 is movable in the X, Y, and Z directions and rotatable in the θ direction. The glass substrate 9 is placed on the table 21. The die 22 is made of a metal such as amber alloy having a coefficient of thermal expansion of 1.5 × 10 ⁻⁶ cm / ° C. or less, and has a slit formed at the lower end. Die 22
Contains a colored ink. An inert gas is used to apply pressure from the supply hole 23 of the die 22, and the colored ink is ejected from the slit on the lower surface of the die 22. The colored layer 26 is formed on the glass substrate 9 with the jetted colored ink.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color filter used for a display panel of a color liquid crystal display device, for example.

[0002]

2. Description of the Related Art A liquid crystal display device is a passive type display which consumes very little power and can be driven at a low voltage.
It can be made into a panel type element, can display a large size, and is inexpensive, and has features not found in a light emitting type display. Therefore, including laptop and book type personal computers and word processors, It is widely used as a display for various OA devices. In particular, in recent years, other than the color cathode ray tube, it has attracted attention as the only display capable of full-color display.

First, an example of a color liquid crystal display device will be described with reference to FIG. The color liquid crystal display device shown in FIG. 8 is an active matrix liquid crystal display device using a three-terminal type thin film transistor.

As shown in FIG. 8, a liquid crystal cell 1 is provided, and the liquid crystal cell 1 is composed of a thin film transistor array 2 and a liquid crystal 4 sandwiched between a color filter 3. Further, the thin film transistor array 2 is formed by a glass substrate 5 and a thin film transistor 6 which forms a pixel electrode on the glass substrate 5. Further, the color filter 3 includes a glass substrate 7, colored layers 8 of R, G, and B formed on the glass substrate 7 and the liquid crystal cell 1.
And a transparent electrode 9 which is one of the electrodes.

Deflection plates 10 and 11 are provided on both end faces of the liquid crystal cell 1, and a three-wavelength type backlight 12 is provided on the rear part thereof.

When the thin film transistor 6 is in the off state, the liquid crystal pixel is in the transmissive state, and R, G, B corresponding to the color filter 3, that is, red light, green light and blue light are turned on and the three primary colors are emitted. Is obtained, and any color is developed by color mixing. Furthermore, by adjusting the switching timing of the thin film transistor 6, it is possible to add gradation and full color display is possible.

As a method of manufacturing the color filter 3, there are a dyeing method, a pigment dispersion method, a printing method, an electrodeposition method and the like. The dyeing method is, for example, a method of dyeing a relief obtained by patterning a gelatin film by a photolithography method. The pigment dispersion method is a method of patterning a polymer dispersed with a pigment by a photolithography method. Further, the printing method is a method of directly forming a pattern by printing using a polymer dispersed with a pigment. The electrodeposition method is a method of patterning a transparent conductive film and applying a coloring layer by an electrophoretic method or an electrolytic polymerization method.

On the other hand, the dyeing method and the pigment dispersion method have been developed and partially put into practical use, but the process is complicated and the cost does not decrease.

On the other hand, the printing method has received a great deal of attention as a technology capable of cost reduction, and it is said that accuracy, appearance quality and parallelism are inferior to those using a photolithography technology such as a dyeing method and a pigment dispersion method. Development is underway for improvement.

As a method of manufacturing a color filter, as shown in FIGS. 9 and 10, an offset printing method using an intaglio plate or a waterless planographic plate is drawing attention. In the offset printing method, as shown in FIG. 9, first, the coloring ink 17 is transferred to the blanket 18 by rotating the blanket 18 in the concave portion of the plate 16. Next, as shown in FIG. 10, the colored ink 17 transferred to the blanket 18 is applied to the glass substrate 9
It is a method to transfer on. This offset printing method
The edge of the pattern of the colored ink 17 on the 16 is excellent, the thickness of the colored ink 17 can be easily adjusted by the depth of the recess of the plate 16, and the plate 16 is made of metal in terms of printing accuracy. Since it can be used, it is in a position that is the most practical of all printing methods.

However, as shown in FIG. 6, the colored cross section of the colored ink 17 immediately after printing is a kamaboko shape, and smoothing and polishing are required after transfer, so that the cost is not necessarily reduced. I won't.

[0012]

As described above, although the method using photolithography such as the dyeing method and the pigment dispersion method has been partially put into practical use, the process is complicated and the cost does not decrease.

Although the printing method can reduce the cost, it is inferior in accuracy, appearance quality and parallelism to those using a photolithography technique such as a dyeing method and a pigment dispersion method.

Further, in the offset printing method, after transfer,
Since it requires treatments such as smoothing and polishing, there is a problem that the price is not necessarily reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for manufacturing a color filter which does not require post-processing and can be manufactured at a low cost.

[0016]

A method for manufacturing a color filter according to claim 1, wherein an ink containing at least a resin, a dye and a solvent is extruded through a die having a plurality of slits formed on a transparent substrate to form an ink layer. To form a desired pattern.

The method of manufacturing a color filter according to claim 2 is the method of manufacturing a color filter according to claim 1, wherein the die has a coefficient of thermal expansion at room temperature of 1.5 × 10 ⁻⁶ cm / cm 2.
It is a metal having a temperature of ℃ or less.

[0018]

A method of manufacturing a color filter according to claim 1,
Ink containing at least a resin, a dye and a solvent is extruded through a die having a plurality of slits formed on a transparent substrate to form an ink layer in a desired pattern, preferably 0.5.
By forming the ink layer to have a thickness of 10 μm, the ink layer can be directly formed, no post-treatment is required, and the cost can be reduced.

The method of manufacturing a color filter according to claim 2 is the method of manufacturing a color filter according to claim 1, wherein the die has a coefficient of thermal expansion of 1.5 × 10 ⁻⁶ cm / ° C. at room temperature.
Since the following metals are used, the ink layer can be formed with a constant thickness regardless of the temperature.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The table 21 shown in FIGS. 1 and 2 is movable in the X, Y and Z directions, and rotatable in the θ direction. Then, on the table 21, for example, a glass substrate 9 of Model No. 7059 manufactured by Corning is placed.

Reference numeral 22 denotes a metal die made of a single metal or an alloy having a coefficient of thermal expansion of 1.5 × 10 ^-6 cm / ° C. or less, such as amber alloy, and the lower end of the die 22 is not shown. A slit is formed. This die 22
Contains colored ink. Further, a supply hole 23 for supplying an inert gas or the like is formed in the upper portion of the die 22.

Further, the die 22 is composed of three components of red ink (R), green ink (G) and blue ink (B).
One is prepared.

Next, the manufacture according to the above embodiment will be described.

First, pressure is applied to the die 22 from the supply hole 23 using an inert gas or the like. This pressure causes the colored ink to be ejected from the lower surface of the die 22. Then, the colored layer 26 as an ink layer is formed on the glass substrate 9 by the output colored ink.

Further, when forming the colored layer 26, three dies 22 which are shifted by the pitch of the colored layer 26 are used and are arranged continuously in the forward direction, so that three layers of R, G and B are formed. Can be formed simultaneously.

Further, as shown in FIGS. 3 and 4, the color filter 3 is formed by patterning chromium (Cr), black resist or the like on the glass substrate 9 by a photolithography method to form a black matrix 27, and the black matrix 27 is formed. The colored layer 26 is formed on the 27 in a stripe shape or a delta arrangement.

That is, the striped structure shown in FIG. 3 is formed by advancing each die 22 only, and the delta array structure shown in FIG. 4 is formed in each die 22.
Repeatedly ejecting and stopping the coloring ink for each pixel, moving the glass substrate 9 in the Y direction, and repeating ejection again to form the ink.

Further, specific materials and numerical values used in the experiment will be described.

First, the coloring ink contains a resin, red, green and blue pigments and a solvent. The solvent is a solvent-soluble epoxy resin, the red pigment is a dianthraquinone organic pigment, the green solvent is a halogenated phthalocyanine pigment, the blue pigment is a phthalocyanine pigment, and the solvent is ethylene glycol monomethyl ether and diethylene glycol monomethyl ether. Is used. The maximum particle diameter contained is 0.1 μm or less, and the viscosity of the colored ink is 100 to 200 poise. Then, the gap between the die 22 and the glass substrate 9 is set to 17 to 22 μm.
m, the applied pressure to the colored ink is 3 to 5 kg / cm ² , and the advancing speed of the glass substrate 9 is 10 to 20 cm / min.
m colored layer 26 was formed.

Then, after baking at 200 to 250 ° C. for 2 to 4 hours, an overcoat layer made of epoxy, epoxy acrylate, etc., and a conductive film made of ITO (Indium Tin Oxide) are formed.

As shown in FIG. 5, the cross section of the colored layer 26 formed by the above-described embodiment has a flat upper portion, and has the same shape as the conventional pigment dispersion method shown in FIG. Unlike the offset printing method shown in, it does not become a kamaboko type, so
Post-processes such as smoothing are unnecessary.

The die 22 is not limited to the amber alloy,
The coefficient of thermal expansion is 1.5 × 10 ^-6 cm / ° C near room temperature, such as Super Amber alloy and Stainless Amber alloy.
Any metal such as the following single metals or alloys may be used. In this way, by using a metal with a small coefficient of thermal expansion,
High accuracy can be obtained regardless of changes in temperature.

For the colored ink, the solvent is epoxy /
Benzoaguanamine mixed resin, red pigment is dianthraquinone type organic pigment, green pigment is halogenated copper phthalocyanine type pigment, blue pigment is sulfoca copper phthalocyanine type pigment, solvent is diethylene glycol monoethyl ether and diethylene glycol monobutyl ether,
Further, those using phthalic anhydride as an additive may be used. Of these, the epoxy / benzagnamine mixed resin, which is the vehicle of the ink, has undergone a preliminary reaction to increase the ink suitability and has increased the molecular weight.

[0035]

According to the method of manufacturing a color filter of claim 1, the ink containing at least a resin, a dye and a solvent is extruded through a die having a plurality of slits formed on a transparent substrate to form an ink layer in a desired pattern. In this case, the ink layer can be directly formed, the post-treatment is unnecessary, the cost can be reduced, and a plurality of colors can be formed at once.

The method of manufacturing a color filter according to claim 2 is the method of manufacturing a color filter according to claim 1, wherein the die has a coefficient of thermal expansion at room temperature of 1.5 × 10 ⁻⁶ cm / ° C.
Since the following metals are used, the ink layer can be formed with a constant thickness regardless of the temperature.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the same substrate.

FIG. 3 is a perspective view in which a part of the same ink layer is cut away.

FIG. 4 is a perspective view in which a part of an ink layer having another shape is cut away.

FIG. 5 is a cross-sectional view of an ink layer formed according to the example.

FIG. 6 is a cross-sectional view of an ink layer formed by offset printing.

FIG. 7 is a cross-sectional view of an ink layer formed by a pigment dispersion method.

FIG. 8 is an exploded perspective view showing a color liquid crystal display device.

FIG. 9 is an explanatory diagram showing a step of the offset printing method.

FIG. 10 is an explanatory diagram showing a step subsequent to FIG. 9 of the offset printing method.

[Explanation of symbols]

9 glass substrates 22 die 26 Colored layer as ink layer

Claims (2)

[Claims] 1. A color filter characterized in that an ink containing at least a resin, a dye and a solvent is extruded through a die having a plurality of slits formed on a transparent substrate to form an ink layer in a desired pattern. Method. 2. The die has a coefficient of thermal expansion at room temperature of 1.5 × 1.
The color filter manufacturing method according to claim 1, wherein the metal is 0 ^-6 cm / ° C or less.